Microstructural Investigation of Nanocrystalline Hydrogen-Storing Mg-Titanate Nanotube Composites Processed by High-Pressure Torsion

Marcell Gajdics, Tony Spassov, Viktória Kovács Kis, Ferenc Béke, Zoltán Novák, Erhard Schafler and Ádám Révész
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Marcell Gajdics: Department of Materials Physics, Eötvös University, P.O.B. 32, H-1518 Budapest, Hungary
Tony Spassov: Department of Chemistry, University of Sofia “St.Kl.Ohridski”, 1164 Sofia, Bulgaria
Viktória Kovács Kis: Center of Energy Research, Hungarian Academy of Sciences, H-1121 Budapest, Hungary
Ferenc Béke: Department of Organic Chemistry, Eötvös University, P.O.B. 32, H-1518 Budapest, Hungary
Zoltán Novák: Department of Organic Chemistry, Eötvös University, P.O.B. 32, H-1518 Budapest, Hungary
Erhard Schafler: Faculty of Physics, University of Vienna, A-1090 Vienna, Austria
Ádám Révész: Department of Materials Physics, Eötvös University, P.O.B. 32, H-1518 Budapest, Hungary

Energies, 2020, vol. 13, issue 3, 1-14

Abstract: A high-energy ball milling and subsequent high-pressure torsion method was applied to synthesize nanocrystalline magnesium samples catalyzed by TiO 2 or titanate nanotubes. The microstructure of the as-milled powders and the torqued bulk disks was characterized by X-ray diffraction. The recorded diffractograms have been evaluated by the convolutional multiple whole profile fitting algorithm, which provided microstructural parameters (average crystal size, crystallite size distribution, average dislocation density). The morphology of the nanotube-containing disks has been examined by high-resolution transmission electron microscopy. The effect of the different additives and preparation conditions on the hydrogen absorption behavior was investigated in a Sieverts’-type apparatus. It was found that the ball-milling route has a prominent effect on the dispersion and morphology of the titanate nanotubes, and the absorption capability of the Mg-based composite is highly dependent on these features.

Keywords: ball milling; high-pressure torsion; magnesium; titanate nanotubes; hydrogen storage (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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